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2. Tropical Convection

2. Tropical Convection. 2. Tropical Convection. 2. Tropical Convection. 2. Tropical Convection. See http://www.nrlmry.navy.mil/sat-bin/tropics.cgi. 2. Tropical Convection. 2.1 Conditional Instability and CAPE 2.2 Dry Convection 2.3 Available Potential Energy for Convective Downdrafts

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2. Tropical Convection

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  1. 2. Tropical Convection

  2. 2. Tropical Convection

  3. 2. Tropical Convection

  4. 2. Tropical Convection See http://www.nrlmry.navy.mil/sat-bin/tropics.cgi

  5. 2. Tropical Convection 2.1 Conditional Instability and CAPE 2.2 Dry Convection 2.3 Available Potential Energy for Convective Downdrafts 2.4 Some Observations over West Africa 2.5 Mesoscale Convective Systems 1 Problem sheet will be given for this section

  6. 2.1 Conditional Instability and CAPE

  7. 2.2 Dry Convection (see notes) 2.3 Available Potential Energy for Convective Downdrafts (see notes)

  8. 2.4 Some observations from the JET2000 experiment Thorncroft et al, 2003 BAMS Parker et al, 2005 QJRMS

  9. Experimental Details • C130 aircraft flew 4 legs over this region: 25-30 August 2000 • Dropsondes every 0.5-1 degree • Low level flights on north-south transect Met Office C-130 At Niamey Airport, Niger

  10. 2-5 day filtered V at 700mb (from ECMWF) Weak AEW activity JET2000 Period

  11. Dropsonde locations – on the 28th August 2000

  12. ECMWF PBL fields compared to observations Potential temperature Equivalent potential temperature

  13. Zonal Wind 28th August 2000

  14. Thermodynamic Profiles 28th August 2000

  15. Thermodynamic Profiles 28th August 2000

  16. Thermodynamic Profiles 28th August 2000 Height of AEJ

  17. Saturated equivalent potential temperature 28th August 2000 Closer to moist adiabatic Close to dry adiabatic

  18. Equivalent Potential Temperature 28th August 2000 Variability in boundary layer θe (surface conditions) Elevated SAL is a region of lateral mixing (e.g. q, aerosol)

  19. Boundary Layer Buoyancy 28th August 2000 Larger CIN and +ve buoyancy Smaller CIN and +ve buoyancy

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